El Castillo del Terror (2010) was a professional wrestling event, the fifth annual El Castillo del Terror event, produced by the International Wrestling Revolution Group (IWRG). IWRG has held an Castillo del Terror branded show since 2005, usually late in the year, making this year's event the fifth overall event in the series. The event took place on November 1, 2009, at Arena Naucalpan in Naucalpan, State of Mexico, IWRG's main arena. The main event was the eponymous Castillo del Terror (Spanish for "Castle of Terror") Steel cage match where the last person eliminated was forced to unmasked per the match stipulation. In the end the ten-man match saw Oficial 911 defeat Yack, forcing him to unmask after the match.

Starting as far back as at least 2002, the Mexican wrestling promotion International Wrestling Revolution Group (IWRG; Sometimes referred to as Grupo Internacional Revolución in Spanish) has held several annual events where the main event was a multi-man steel cage match where the last wrestler left in the cage would be forced to either remove their wrestling mask or have their hair shaved off under Lucha de Apuestas, or "bet match", rules. From 2005 IWRG has promoted a fall show, around the Mexican Day of the Death, under the name El Castillo del Terror ("The Tower of Terror") to distinguish it from other Steel cage matches held throughout the year such as the IWRG Guerra del Golfo ("Gulf War"), IWRG Guerra de Sexos ("War of the Sexes") or IWRG Prison Fatal ("Deadly Prison") shows. The Castillo del Terror shows, as well as the majority of the IWRG shows in general, are held in "Arena Naucalpan", owned by the promoters of IWRG and their main arena. The 2009 Castillo del Terror show was the fifth year in a row that IWRG promoted a show under that name.

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